This IPCQUEEN Power Supply Tester design with LCD screen to easy read the ATX Power Supply Unit power voltage. Easy to plug with ATX PSU 24-pin and Plug-in ( P4/P6/P8) to show the voltage on the LCD panel. Tests 20-pin and 24-pin power supplies. Tests SATA power. Tests Pentium 4 power connector. Tests PCI-Express power connectors. Tests Xeon power connectors. Tests Floppy drive connectors. Tests standard 4-pin power supply connectors.